Improvement in oscillating balanced valves



AQW. ELBRE DGL- Oscillating Balanced Valve.

Patented Sept. 14,1875.

NJETERS, PHDTO-LITHOGRAFHER, WASHING ON, D C.

UNITED STATEs PATENT OFFICE.

ALONZO W. ELDREDGE, OF BIG RAPIDS, ASSIGNOR OF ONE-FOURTH HIS RIGHT TOFITCH PHELPS, OF MEOOSTA, MICHIGAN.

IMPROVEMENT IN OSCILLATING BALANCED VALVES.

Specification forming part of Letters Patent No. 167,754, datedSeptember 14, 1875; application filed June 17, 1875.

To all whom it may concern;

Be it known that I, ALONZO W. EL- DREDGE, of Big Rapids, in the countyof Mecosta and State of Michigan, have invented an Improvement inSteam-Engines, of which the following is a specification The nature ofmy invention relates to an improved form of balanced oscillating valvesfor a steamengine; and consists in the peculiar construction of anelevated valveseat, and the combination therewith of two circularvalves, one at each side, mounted on a rock-shaft which oscillatesthrough the axis of said seat. I

Figure 1 is a perspective View, with a portion of the steam-chest brokenaway. Fig. 2 is a longitudinal vertical section at :10 as. Fig. 3 is atransverse vertical section at y y. Fig. 4 is an elevation of the faceof one valve. Fig. 5 is a cross-section of the same at z z.

In the drawing, A represents that part of a steam cylinder which isincluded in the steam -chest, having the steam -ports a a, with anexhaustport, b, between them. B is a longitudinally-disposed elevatedvalveseat, bolted to the ordinary. valveseat A. Two transverse ports, aa are radially cut through the raised seat, with a passage from eachleading down to the port a below it. Between the ports a an exhaustport,1), extends transversely through the seat, and from the interior a shortpassage communicates with the exhaust-port b of the cylinder.

The sides or checks of the seat B are circular, and through the axis iscored a bearing-tube, c, for the rock shaft 0. The seat, above the portsa a is cored out, forming a sector-shaped chamber.

D D are two disk-valves, each formed with a radial steam port, ed, ateach side of a radial exhaustrecess, b cored in its inner face, and isaxially mounted on the rock-shaft O. E is the steam chest, bolted to thecylinder, and is provided with the heads E E, one at each side, throughone of which the rock-shaft oscillates in a stuffing-box,F. Near theperiphery of each valve an annular groove is turned in its face, andanother one close to the central eye, through which the rock-shaft isinserted. At each side of each steam-port a radial groove is planed inthe valve face, extending from the inner to the outer groove.

In the annular grooves brass or other packing-rings c-are laid in, andin the radial grooves a packingbar, 0, is laid in each, which rings andbars may be set out, either by springs under them or by steam-pressure,as preferred, their purpose being to relieve the face of the valve fromwear, and to prevent steam from blowing through from port to port.

The valves are adjustably secured on the rock-shaft by set-screws tappedthrough their hubs, and may be set up to the seat as oocasion mayrequire. The protruding end of the rock-shaft is fitted with an arm, (3,with which an eccentric rod may engage to oscillate the shaft andvalves.

The pressure of the steam being on both valves, the seat is relievedfrom pressure of the valves upon the same, as the pressure of one valveis balanced by that of the other in the opposite direction through therockshaft.

A steam-port, c of the seat being disclosed by the port a of the valveat each side, steam will flow through the passage of the port a of thatend of the cylinder, while the ports a a of the other end of thecylinder will beclosed by the valves; but the port chest and into theupper part or chamber of the valve-seat, in each side of which, at thelowest corner, there is tapped a very small aperture, g, which isdisclosed by a valve port for an instant at each oscillation of thevalves, thereby permitti-ng a minute quantity of oil to flow out, whichis absorbed by the steam, and thus lubricates allthe moving parts withwhich it is brought into contact.

The valves for the larger class of engines may be cast with lugs attheir peripheries, projecting beyond the edge of the chest, and

nation with the hollow elevated valve-seat B, provided with the ports aa N, substantially staybraces provided to connect the lugs of as and forthe purpose set forth. one valve with those of the other, to prevent thevalves from springing.

What I claim as my invention is- The valves D D, constructed asdescribed, and mounted upon the rock-shaft G, in combi- ALONZO W.ELDBEDGE. Witnesses:

E. F. DEWEY, F. D. BROWN.

